public partial class MainWindow : Window
{
// A static list to hold task data for use in the chart
    public static List<Task> taskData;

    public MainWindow()
    {
        InitializeComponent();

        taskData = GetTasksData();
        flexchart.Header = "Release Schedule";
        flexchart.HeaderStyle = new ChartStyle { FontSize = 14, FontWeight=FontWeights.Bold };         
        flexchart.Background = Brushes.LightGray;
        flexchart.ChartType = ChartType.Bar;                       
        flexchart.BindingX = "Name";
        flexchart.ItemsSource = taskData;
        flexchart.Binding = "Start,End"; 
        flexchart.Series.Add(new GanntSeries(taskData) { Tooltip = "{TooltipContent}" });
        flexchart.DataLabel.Content = "{DurationInWeeks:n1} Weeks";
        flexchart.DataLabel.Position = LabelPosition.Left;
        flexchart.AxisX.Min = taskData[0].Start.ToOADate();
        flexchart.AxisX.MajorUnit = 7D;
        flexchart.AxisX.MajorGrid = true;
        flexchart.AxisY.Reversed = true;
    }

    // Method to create and return a list of tasks with their start and end dates
    public static List<Task> GetTasksData()
    {
        var taskList = new List<Task>();
        var year = DateTime.Now.Year;
        taskList.Add(new Task { Name = "Plan", Start = new DateTime(year, 5, 5), End = new DateTime(year, 5, 11) });
        taskList.Add(new Task { Name = "Design", Start = new DateTime(year, 5, 12), End = new DateTime(year, 5, 18) });
        taskList.Add(new Task { Name = "Development", Start = new DateTime(year, 5, 19), End = new DateTime(year, 5, 30) });
        taskList.Add(new Task { Name = "Test Accept", Start = new DateTime(year, 6, 1), End = new DateTime(year, 6, 14) });
        taskList.Add(new Task { Name = "Distribution", Start = new DateTime(year, 6, 14), End = new DateTime(year, 6, 21) });
        return taskList;
    }
}

// Custom series class for Gantt chart representation
public class GanntSeries : Series, ISeries
{
    List<Task> taskData;
    public GanntSeries(List<Task> taskData)
    {
        this.taskData = taskData;

        // Event handler for custom rendering of the symbols (bars) in the Gantt chart
        SymbolRendering += (s, e) =>
        {
            // Get the color from the chart's palette for each task (bar)
            var color = ((IPalette)ActualChart).GetColor(e.Index);

            // Set the fill and stroke (border) colors for the bar
            e.Engine.SetFill(color);
            e.Engine.SetStroke(color);
        };
    }

    // multiple legend items for the series
    string ISeries.GetLegendItemName(int index) => taskData[index].Name; 
   _Style ISeries.GetLegendItemStyle(int index) => new _Style { Fill = ((IPalette)ActualChart).GetColor(index) };
    int ISeries.GetLegendItemLength() => taskData.Count;
}

public class Task
{
    public string Name { get; set; } // The name of the task
    public DateTime Start { get; set; } // The start date of the task
    public DateTime End { get; set; } // The end date of the task

    // Optional: You can add a method to calculate the duration of the task
    public TimeSpan Duration => (End - Start);
    public double DurationInWeeks => Duration.TotalDays / 7;

    // Content for the tooltip to show task start and end dates
    public string TooltipContent => $"{Start:MMM-dd} to {End:MMM-dd}";
}